Fix ? / 0.00h display for in-progress shifts

Frontend: pivotWfShifts now skips entries where times='?' and hours=0
— immediately removes the visual glitch from any stale DB rows.

Backend: when today's timesheet pull finds no completed shifts, write
a source='workforce' row instead of skipping, so the stale timesheet
entry is overwritten and rota sync can restore schedule data for today.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/Planner.tsx

@@ -836,6 +836,8 @@ function pivotWfShifts(wfShifts: Record<string, WfDayData>, dates: string[]): Wf
     const day = wfShifts[date]
     if (!day) continue
     for (const s of day.staff) {
+      // Skip in-progress timesheet entries — clocked in but no clock-out time yet
+      if (s.times === '?' && s.hours === 0) continue
       if (!members[s.id]) members[s.id] = { id: s.id, name: s.name, days: {} }
       members[s.id].days[date] = { hours: s.hours, times: s.times, status: s.status }
     }